Mixtures of sabadilla alkaloids and phenylpyrazoles and uses thereof

ABSTRACT

The present invention is directed to pesticidal mixtures comprising sabadilla alkaloids and at least one phenylpyrazole and methods of controlling pests including insects and mites by application of pesticidal mixtures comprising sabadilla alkaloids and at least one phenylpyrazole.

FIELD OF THE INVENTION

The present invention is directed to pesticidal mixtures comprising sabadilla alkaloids and at least one phenylpyrazole and methods of controlling pests including insects and mites by application of pesticidal mixtures comprising sabadilla alkaloids and at least one phenylpyrazole.

BACKGROUND OF THE INVENTION

Arthropod pests are one of the major threats to human welfare and exert continued stress on the food supply and transmit a broad array of medical and veterinary diseases. Synthetic insecticides played a significant role and in many ways ushered in modern agriculture and pest control. However, the widespread use of synthetic insecticides also created numerous environmental challenges. The acute effects of synthetic pesticides on professional applicators and other end users are well-known but the chronic long term human health effects can be equally serious. Further, the use of synthetic insecticides has led to the development of resistant insect populations. Insecticide resistance is a complex phenomenon underlined by a diverse array of physiological mechanisms. Major mechanisms that are responsible for the development of insecticide resistance are metabolic detoxification, target site mutation, reduced cuticular penetration and behavioral avoidance.

Integrated Pest Management (“IPM”) is a holistic approach to pest management. A fundamental aspect of insecticide utilization under the broader framework of IPM is the management of insecticide resistance (IRM) by the utilization of insecticide combinations that reduce the rate of resistance development. A combination of insecticides with different modes of action is fundamentally a concept based upon the idea of redundant killing of target insects. Insects adapted to one of the active ingredient in the combination product will still be killed by the other active ingredient. Mixtures can also reduce the amount of pesticides applied in the environment and the environmental impact associated with pesticide applications.

Unlike conventional insecticides which are typically based on a single active ingredient, plant derived insecticides usually comprise an array of chemical compounds that affect both behavioral and physiological functions of the target arthropods. The probability of pest resistance developing to a combination of plant derived insecticides and synthetic pesticides is less than for a combination of synthetic pesticides because plant derived insecticides have a variety of modes of action. Further, the use of the plant derived pesticide in the combination may lower the amount of synthetic pesticide necessary to effectively control the target pest thus reducing any possible harm to humans, livestock, pets and the environment in general.

One effective naturally derived pesticide is found in the tissues of many of the plants of the genus Schoenocaulon, commonly referred to as sabadilla. The species with the longest history of use, and the most readily available, is Schoenocaulon officinale. The plant is indigenous to Central and South America and its seeds have been used for centuries for their insecticidal properties. The seeds contain several alkaloids including veratridine and cevadine, both of which are known to be active against arthropods.

Phenylpyrazoles are effective synthetic insecticides. Phenylpyrazoles work by blocking GABA-gated chloride channels and glutamate-gated chloride channels in insectcells causing paralysis, and then death. Phenylpyrazoles include fipronil, pyriprole, ethiprole, acetoprole, flufiprole, pyraclofos, pyrafluprole, pyrolan and vaniliprole, and are sold under the tradenames Regent®, Goliath®, and Nexa® (fipronil) and Prac-tic® (pyriprole).

Thus, there is a need in the art for pesticide combinations that contain plant derived pesticides that decrease health concerns to humans and also decrease the risk of the development of pesticide resistance.

SUMMARY OF THE INVENTION

In one aspect, the present invention is directed to pesticidal mixtures of sabadilla alkaloids and at least one phenylpyrazole.

In another aspect, the present invention is directed to methods of controlling pests, including insects and mites, comprising applying effective amounts of a mixture of sabadilla alkaloids and at least one phenylpyrazole.

In a preferred aspect, the sabadilla alkaloids are derived from Schoenocaulon officinale.

DETAILED DESCRIPTION OF THE INVENTION

Applicant unexpectedly discovered that pesticidal mixtures of sabadilla alkaloids and phenylpyrazoles provided enhanced pesticidal activity compared to either pesticide alone. Further, Applicant discovered that pesticidal mixtures of sabadilla alkaloids and phenylpyrazoles were capable of controlling a large variety of arthropods.

The present invention is directed to pesticidal mixtures comprising an effective amount of sabadilla alkaloids and at least one phenylpyrazole.

Sabadilla alkaloids may be derived from any species of Schoenocaulon. The genus Schoenocaulon includes the following species: S. calcicola, S. caricifolium, S. comatum, S. conzattii, S. dubium (alt. S. gracile), S. framei, S. ghiesbreghtii (alt. S. drummondii, S. yucatanense), S. ignigenum, S. intermedium, S. jaliscense, S. macrocarpum (alt. S. lauricola), S. madidorum, S. megarrhizum, S. mortonii, S. oaxacense, S. obtusum, S. officinale, S. pellucidum, S. plumosum, S. pringlei, S. rzedowskii, S. tenorioi, S. tenue, S. tenuifolium, S. texanum, and S. tigrense. In a preferred embodiment the sabadilla alkaloids are derived from S. officinale. In another preferred embodiment the sabadilla alkaloids are veratridine and cevadine.

Phenylpyrazoles suitable for the present invention include, but are not limited to, fipronil, pyriprole, ethiprole, acetoprole, flufiprole, pyraclofos, pyrafluprole, pyrolan and vaniliprole.

As used herein, all numerical values relating to amounts, weight percentages and the like are defined as “about” or “approximately” each particular value, namely, plus or minus 10%. For example, the phrase “at least 5% by weight” is to be understood as “at least 4.5% to 5.5% by weight.” Therefore, amounts within 10% of the claimed values are encompassed by the scope of the claims.

The term “effective amount” means the amount of the formulation that will control the target pest. The “effective amount” will vary depending on the mixture concentration, the type of pest(s) being treated, the severity of the pest infestation, the result desired, and the life stage of the pest during treatment, among other factors. Thus, it is not always possible to specify an exact “effective amount.” However, an appropriate “effective amount” in any individual case may be determined by one of ordinary skill in the art.

As used herein, w/w denotes weight by weight of the total mixture.

In a preferred embodiment, the ratio of sabadilla alkaloids to the at least one phenylpyrazole is from about 10,000:1 to about 1:2.5, more preferably from about 17:1 to about 1:1.2, from about 10,000:1 to about 500:1, from about 17:1 to about 1:2.5 and about 10,000:1, about 5,000:1, about 1,000:1, about 500:1, about 17:1, about 8.3:1, about 4:1, about 1.7:1, about 1:1.2 and about 1:2.5.

In another preferred embodiment, the pesticidal mixtures of the present invention may contain one or more excipients selected from the group consisting of solvents, anti-caking agents, stabilizers, defoamers, slip agents, humectants, dispersants, wetting agents, thickening agents, emulsifiers, penetrants, adjuvants, synergists, polymers, propellants and/or preservatives.

The present invention is further directed to methods of controlling a pest comprising applying a pesticidal mixture comprising an effective amount of sabadilla alkaloids and at least one phenylpyrazole to the pest or the pest's environment.

In a preferred embodiment, the pest is selected from an insect and a mite.

In an embodiment, the pest controlled is selected from the group consisting of bed bugs (Hemiptera), fleas (Siphonaptera), beetles (Coleoptera), cockroaches (Blattodea), flies (Diptera), ants (Hymenoptera), mosquitoes (Culicidae), termites (Isoptera) and mites (Acari). In a preferred embodiment, the pest controlled are selected from the group consisting of common bed bugs (Cimex lectularius), house fly (Musca domestica), yellow fever mosquito (Aedes aegypti), southern house mosquito (Culex quinquefasciatus), African malaria mosquito (Anopheles gambiae), common malaria mosquito (Anopheles quadrimaculatus) and German cockroach (Blattella germanica).

The pesticidal mixtures of the present invention can be applied by any convenient means. Those skilled in the art are familiar with the modes of application including spraying, brushing, soaking, in-furrow treatments, pressurized liquids (aerosols), fogging or side-dressing.

In a preferred embodiment, sabadilla alkaloids are applied to the pest or the pest's environment at a rate from about 1 to about 1,000 grams per hectare (“g/HA”), preferably from about 10 to about 700 g/HA and most preferably from about 22 to about 560 g/HA.

In a preferred embodiment, the at least one phenylpyrazole is applied to the pest or the pest's environment at a rate from about 1 to about 100 g/HA, more preferably from about 10 to about 70 g/HA and most preferably from about 15 to about 60 g/HA.

In another preferred embodiment, pesticidal mixtures of the present invention comprise from about 0.05% to about 0.5% w/w sabadilla alkaloids.

In another preferred embodiment, pesticidal mixtures of the present invention comprise from about 0.0005% to about 0.125% w/w of at least one phenylpyrazole, more preferably from about 0.0005% to about 0.001% w/w, from about 0.03% to about 0.125% w/w, and from about 0.03 to about 0.06% w/w.

As used herein, “control” a pest or “controlling” pest(s) refers to killing, incapacitating, repelling, or otherwise decreasing the negative impact of the pest on plants or animals to a level that is desirable to the grower or animal.

As used herein, “pest's environment” refers to any area that the pest is present during any life stage. One environment likely to be treated by the methods of the present invention includes the plants and plant propagation materials that the pest is living on and the surrounding soil. The pest's environment may also include harvested plants, gardens, fields, greenhouses, or other buildings, and various indoor surfaces and structures, such as furniture including beds, and furnishings including books, clothing, etc.

The articles “a,” “an” and “the” are intended to include the plural as well as the singular, unless the context clearly indicates otherwise. For example, the methods of the present invention are directed to controlling “pest” but this can include control of a multiple pests (such as a more than one insect or more than one insect species or more than one mite or more than one mite species).

The following examples are intended to illustrate the present invention and to teach one of ordinary skill in the art how to use the extracts of the invention. They are not intended to be limiting in any way.

EXAMPLES Example 1—German Cockroach

In this study, the response of the German cockroach (Blattella germanica) to application of a 1.7:1, 17:1, 1:1.2 and 8.3:1 ratio of sabadilla (S. officinale) alkaloids to at least one phenylpyrazole will be observed. Specifically, sabadilla alkaloids and at least one phenylpyrazole will be applied to the pest at the respective rates of: 1) 0.05% w/w to 0.03% w/w, 2) 0.5% w/w to 0.03% w/w, 3) 0.05% w/w to 0.06% w/w and 4) 0.5% w/w to 0.06% w/w.

The results of the study are predicted to show more than an additive effect. One can determine that the response is synergistic using the following formula: % C_(exp)=A+B−(AB/100).

% C_(exp)=A+B−(AB/100), where % C_(exp) is the expected efficacy and “in which A and B are the control levels given by the single [insecticides]. If the ratio between the experimentally observed efficacy of the mixture C_(obs) and the expected efficacy of the mixture is greater than 1, synergistic interactions are present in the mixture.” (Gisi, Synergisitic Interaction of Fungicides in Mixtures, The American Phytopathological Society, 86:11, 1273-1279, 1996). Adopting a conservative approach, Applicant determined synergy to be present at ratios of >1.1.

Example 2—House Fly

In this study, the response of the house fly (Musca domestica) to application of a 1.7:1, 17:1, 1:1.2 and 8.3:1 ratio of sabadilla (S. officinale) alkaloids to at least one phenylpyrazole will be observed. Specifically, sabadilla alkaloids and at least one phenylpyrazole will be applied to the pest at the respective rates of: 1) 0.05% w/w to 0.03% w/w, 2) 0.5% w/w to 0.03% w/w, 3) 0.05% w/w to 0.06% w/w and 4) 0.5% w/w to 0.06% w/w.

The results of the study are predicted to show more than an additive effect. One can determine that the response is synergistic using the following formula: % C_(exp)=A+B−(AB/100).

Example 3—Mosquitoes

In this study, the response of mosquitoes to application of a 1,000:1, 10,000:1, 500:1 and 5,000:1 ratio of sabadilla (S. officinale) alkaloids to at least one phenylpyrazole will be observed. Specifically, sabadilla alkaloids and at least one phenylpyrazole will be applied to the pest at the respective rates of: 1) 0.05% w/w to 0.00005% w/w, 2) 0.5% w/w to 0.00005% w/w, 3) 0.05% w/w to 0.0001% w/w and 4) 0.5% w/w to 0.0001% w/w.

The results of the study are predicted to show more than an additive effect. One can determine that the response is synergistic using the following formula: % C_(exp)=A+B−(AB/100).

Example 4—Termites

In this study, the response of termites to application of a 1.7:1, 17:1, 1:2.5, and 4:1 ratio of sabadilla (S. officinale) alkaloids to at least one phenylpyrazole will be observed. Specifically, sabadilla alkaloids and at least one phenylpyrazole will be applied to the pest at the respective rates of: 1) 0.05% w/w to 0.03% w/w, 2) 0.5% w/w to 0.03% w/w, 3) 0.05% w/w to 0.125% w/w and 4) 0.5% w/w to 0.125% w/w.

The results of the study are predicted to show more than an additive effect. One can determine that the response is synergistic using the following formula: % C_(exp)=A+B−(AB/100). 

What is claimed is:
 1. A pesticidal mixture comprising an effective amount of sabadilla alkaloids and fipronil, wherein the ratio of sabadilla alkaloids to fipronil is from about 500:1 to about 1.7:1.
 2. The mixture of claim 1, wherein the sabadilla alkaloids are derived from Schoenocaulon officinale.
 3. The mixture of claim 1, wherein the sabadilla alkaloids are veratridine and cevadine.
 4. The mixture of claim 1, wherein the sabadilla alkaloids are at a concentration from about 0.05% to about 0.5% w/w, wherein w/w denotes weight by total weight of the mixture.
 5. The mixture of claim 1, wherein fipronil is at a concentration from about 0.01% to about 1% w/w, wherein w/w denotes weight by total weight of the mixture.
 6. The mixture of claim 1 further comprising one or more excipients selected from the group consisting of solvents, anti-caking agents, stabilizers, defoamers, slip agents, humectants, dispersants, wetting agents, thickening agents, emulsifiers, penetrants, adjuvants, synergists, polymers, propellants and preservatives.
 7. A method of controlling a pest selected from the group consisting of Yellow fever mosquito (Aedes aegypti), German cockroach (Blattella germanica), house fly (Musca domestica) and bed bug (Cimex lectularius), comprising applying a pesticidal mixture comprising an effective amount of sabadilla alkaloids and fipronil to the pest or the pests environment, wherein the ratio of sabadilla alkaloids to fipronil is from about 500:1 to about 1.7:1. 